From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <akpm@linux-foundation.org>
Received: from smtp2.linux-foundation.org (smtp2.linux-foundation.org
	[207.189.120.14])
	(using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
	(Client CN "smtp.linux-foundation.org",
	Issuer "CA Cert Signing Authority" (verified OK))
	by ozlabs.org (Postfix) with ESMTP id B6B1FDDE36
	for <linuxppc-dev@ozlabs.org>; Fri, 30 Nov 2007 18:02:47 +1100 (EST)
Date: Thu, 29 Nov 2007 23:02:04 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Kyle McMartin <kyle@mcmartin.ca>, Kamalesh Babulal
	<kamalesh@linux.vnet.ibm.com>,
	LKML <linux-kernel@vger.kernel.org>, linuxppc-dev@ozlabs.org,
	Andy Whitcroft <apw@shadowen.org>, Balbir Singh
	<balbir@linux.vnet.ibm.com>, linux-scsi@vger.kernel.org,
	"Rafael J. Wysocki" <rjw@sisk.pl>, Matthew Wilcox <willy@debian.org>
Subject: Re: [BUG] 2.6.24-rc3-git2 softlockup detected
Message-Id: <20071129230204.8698f47e.akpm@linux-foundation.org>
In-Reply-To: <20071129230047.1b482562.akpm@linux-foundation.org>
References: <474D0AAC.5010005@linux.vnet.ibm.com>
	<20071127225328.9e3f3827.akpm@linux-foundation.org>
	<474D15FF.5080508@linux.vnet.ibm.com>
	<20071127232552.ad16e95c.akpm@linux-foundation.org>
	<474E5CAC.9000108@linux.vnet.ibm.com>
	<20071129003533.54b4b20e.akpm@linux-foundation.org>
	<20071130063929.GD2754@fattire.cabal.ca>
	<20071129230047.1b482562.akpm@linux-foundation.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
List-Id: Linux on PowerPC Developers Mail List <linuxppc-dev.ozlabs.org>
List-Unsubscribe: <https://ozlabs.org/mailman/listinfo/linuxppc-dev>,
	<mailto:linuxppc-dev-request@ozlabs.org?subject=unsubscribe>
List-Archive: <http://ozlabs.org/pipermail/linuxppc-dev>
List-Post: <mailto:linuxppc-dev@ozlabs.org>
List-Help: <mailto:linuxppc-dev-request@ozlabs.org?subject=help>
List-Subscribe: <https://ozlabs.org/mailman/listinfo/linuxppc-dev>,
	<mailto:linuxppc-dev-request@ozlabs.org?subject=subscribe>

On Thu, 29 Nov 2007 23:00:47 -0800 Andrew Morton <akpm@linux-foundation.org> wrote:

> On Fri, 30 Nov 2007 01:39:29 -0500 Kyle McMartin <kyle@mcmartin.ca> wrote:
> 
> > On Thu, Nov 29, 2007 at 12:35:33AM -0800, Andrew Morton wrote:
> > > ten million is close enough to infinity for me to assume that we broke the
> > > driver and that's never going to terminate.
> > > 
> > 
> > how about this? doesn't break things on my pa8800:
> > 
> > diff --git a/drivers/scsi/sym53c8xx_2/sym_hipd.c b/drivers/scsi/sym53c8xx_2/sym_hipd.c
> > index 463f119..ef01cb1 100644
> > --- a/drivers/scsi/sym53c8xx_2/sym_hipd.c
> > +++ b/drivers/scsi/sym53c8xx_2/sym_hipd.c
> > @@ -1037,10 +1037,13 @@ restart_test:
> >  	/*
> >  	 *  Wait 'til done (with timeout)
> >  	 */
> > -	for (i=0; i<SYM_SNOOP_TIMEOUT; i++)
> > +	do {	
> >  		if (INB(np, nc_istat) & (INTF|SIP|DIP))
> >  			break;
> > -	if (i>=SYM_SNOOP_TIMEOUT) {
> > +		msleep(10);
> > +	} while (i++ < SYM_SNOOP_TIMEOUT);
> > +
> > +	if (i >= SYM_SNOOP_TIMEOUT) {
> >  		printf ("CACHE TEST FAILED: timeout.\n");
> >  		return (0x20);
> >  	}
> > diff --git a/drivers/scsi/sym53c8xx_2/sym_hipd.h b/drivers/scsi/sym53c8xx_2/sym_hipd.h
> > index ad07880..85c483b 100644
> > --- a/drivers/scsi/sym53c8xx_2/sym_hipd.h
> > +++ b/drivers/scsi/sym53c8xx_2/sym_hipd.h
> > @@ -339,7 +339,7 @@
> >  /*
> >   *  Misc.
> >   */
> > -#define SYM_SNOOP_TIMEOUT (10000000)
> > +#define SYM_SNOOP_TIMEOUT (1000)
> >  #define BUS_8_BIT	0
> >  #define BUS_16_BIT	1
> >  
> 
> That might be the fix, but do we know what we're actually fixing?  afaik
> 2.6.24-rc3 doesn't get this timeout, 2.6.24-rc3-mm2 does get it and we
> don't know why?
> 

<looks at Subject:>

<Checks that Rafael was cc'ed>

So 2.6.24-rc3 was OK and 2.6.24-rc3-git2 is not?